package com.qiangzhi.interceptor;

import com.qiangzhi.constant.DefaultDataConstant;
import com.qiangzhi.context.BaseContext;
import com.qiangzhi.properties.JwtProperties;
import com.qiangzhi.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        // 当前拦截到的是Controller的方法还是其他资源 拦截到的不是动态方法 直接放行
        if (!(handler instanceof HandlerMethod)) return true;

        // 从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());

        // 校验令牌
        try {
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            Long userId = Long.valueOf(claims.get(DefaultDataConstant.DEFAULT_JWT_CLAIMS).toString());
            log.info("当前用户id：{}", userId);
            BaseContext.setCurrentId(userId);
            // 通过 放行
            return true;
        } catch (Exception ex) {
            // 不通过 响应401状态码
            response.setStatus(401);
            return false;
        }
    }
}
